1L40
Template:Plugin Sidebar 2 The Tektronix 1L40 is a spectrum analyzer plug-in for 500-series scopes. It covers the frequency range from 1.5 GHz to 40 GHz.
The front-end mixer of the 1L40 is a removable module. By default the 1L40 comes with a coaxial mixer, Tek part number 119-0096-00, which works up to 12.4 GHz. The 119-0096-00 contains a 1N415D detector diode.
Type 1L40 was produced for only 3 years, making it the shortest-lived letter-series plug-in.
- 12.4 GHz to 18 GHz requires the 119-0097-00.
- 18 GHz to 26.5 GHz requires the 119-0098-00.
- 26.5 GHz to 40 GHz requires the 119-0099-00.
Note that the 1L40's display of RF signals is actually back-to-front: lower frequencies are to the right, and higher to the left. This is because the 1st LO is above the input signal frequency yet the display shows the IF sweep from low to high left-to-right, so the displayed spectrum is inverted.
The 1L40 is also capable of displaying signals in its IF range of 150-250MHz, because its input is unfiltered so everything passes straight through to the second mixer. In this case, however, the display is left-to-right.
Specifications
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Pictures
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1L40 Front
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Front View from Catalog
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Bent tooth on 1L40 tuning gear provides limit stop in both directions.
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External Mixers and Adaptor
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119-0097-00
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119-0097-00
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119-0098-00
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119-0098-00
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119-0099-00
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119-0099-00
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Front view
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Threequarter view
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Right side view. Note the housing for the removable input mixer at bottom left, and the tuned cavity for the 1st local oscillator at the top.
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Left side view.
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Rear view. Note the selector switch to adapt the sweep input voltage to different models in the 500 series range.
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Bottom view.
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Top view. Cavity for the 1st local oscillator is on the right, and the tuning mechanism is visible. IF filters and attenuators are in the can in the middle.
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Input connector. This is the basic 1.5-12.4GHz input, which can be removed and replaced with an extension cable to waveguide mixers for higher frequencies.
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Closeup of RF centre frequency dial. Fundamental range is at the bottom with harmonics above.
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Closeup of part of the dispersion range switch assembly. Note the two little fingers attached to the shaft which operate the toggle switch.
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1L40 in 535A mainframe tuned to 2100MHz cellular band showing signals. 5MHz/div dispersion.
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Tuned to 2100MHz cellular band (5MHz/div dispersion) showing 3G data downlinks from various operators. From the right: Orange, T-Mobile, Plus and Play. Photo taken in Warsaw, Poland, January 2018.
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Signals displayed straight through the plugin's 150-250MHz IF. Dispersion 5MHz/div, centre frequency 200MHz. The peak on the left is the local DAB radio multiplex on channel 6B, 183.648MHz. The hump to the right of that is the local DVB-T multiplex 'Mux 8' on channel 7. Photo taken in Warsaw, Poland, January 2018.
